My son has cerebral palsy, autism, mental retardation, catatonic schizophrenia, seizures, & no lower left lope of brain what is his life expectancy?

Who knows!: So sorry about your son. All of his conditions you could think might cause a shorter life span for all sorts of reasons, but with good care one never knows. Accidents, poor nutrition ( because he doesn't eat well), progressive brain deterioration if repeated seizures, infections, general stress with its harmful physical effects, all could contribute to premature death. Best of luck!

Hard to say: If you haven't already done so you need to find the local arc chapter.These often provide access to information on these issues, and access to other parents dealing with the problems at different ages. My experience is that most make it into their teens, but depending on their health issues may not make it past their twenties.The hard road ahead is better shared with those in similar situations.